I had a undescended testicle that could not be corrected and had to be removed when I was 18. I asked the doctor at that time about installing a prosthesis and he essentially laughed, saying something like "What do you wanna do - show off that you have two balls?" So, as a result, it was never done. Missing one has never been an impediment, performance wise. I have always been a major horn dog and have been able to satisfy my partners. For me, it has been a major burden psychologically. It makes it appear that I am super-underendowed (grower, not shower). It makes me fearful of intimacy. It makes me fearful of appearing naked in public. It makes me envious of guys with even normal sized ball sacks. At this time, though, I don't know whether it would be worth the bother to get it fixed.